Alert archive / Texas / Flash Flood Warnings in 1997
Flash Flood Warning 12, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Feb 20, 1997, 6:35 PM CST for Liberty County, Polk County, Texas. It was in force for 115 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 20, 1997, 6:35 PM CST (00:35 UTC)
- Expired
- Feb 20, 1997, 8:30 PM CST
- In force
- 115 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Whole counties
Counties Liberty County, TX, Polk County, TX
The radar
The Houston radar (KHGX), 114 km from the middle of the area, began a volume at 00:34 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.6 hours before the alert went out and 160 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 873 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 530 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 286 m²/s²
- 0-3 km storm-relative helicity
- 305 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 6.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KHOU 210034 FFWHOU TXC291-373-210230- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 635 PM CST THU FEB 20 1997 THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 830 PM CST FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHEAST TEXAS ...LIBERTY COUNTY...POLK COUNTY AT 635 PM...RADAR INDICATED A LINE OF STRONG THUNDERSTORMS FROM CORRIGAN TO DAYTON MOVING EAST NEAR 15 MPH. THESE STORMS WILL PRODUCE RAINFALL RATES UP TO 2 INCHES PER HOUR. SHERIFF AND SPOTTER REPORTS INDICATE 3 TO 4 INCHES OF WATER COVERING FM 2457 NEAR BLANCHARD IN POLK COUNTY. ADDITIONAL RAINFALL WILL FURTHER COMPLICATE STREET FLOODING AND FLOODING OF LOW LYING AREAS. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. &
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Houston/Galveston, TX wrote its last area forecast discussion before this flash flood warning went out at Feb 20, 3:21 PM CST, 3 hours 14 minutes earlier.
Area forecast discussion, Feb 20, 3:21 PM CST, 3 hours 14 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 321 PM CST THU FEB 20 1997 500 MB LOW PLACEMENT INITIALIZED WELL WITH THE 160 KM ETA. THE MDL PLACES THE LOW OVR THE HILL COUNTRY BY 00Z...AND SATL LOOPS HAVE CONFIRMED THIS MOVEMENT. AS THE LOW BEGINS TO KICK OUT TWD THE RED RIVER VALLEY THIS EVE...CAN XPC TSTMS TO MOVE E OF THE FCST AREA. THE STMS SHUD BE E OF OR ALONG AN IAH TO GLS LINE BY 02Z THEN E OF THE FCST AREA WELL BEFORE MIDNIGHT. NEED TO CONT THE FLASH FLOOD WATCH OVR SETX FOR EARLY THIS EVE...CAN DROP COUNTIES AS NEEDED. WNDS IN ADV CAT ON THE BACKSIDE OF THE LOW SHUD AFFECT THE FCST AREA FRI. CDFNT MOVS THRU SETX FM THE N FRI AND MINS FRI NGT MAY GET INTO THE 30S. SEE PRELIMS FOR TEMP AND POP INFO. 40 PRELIMS... CLL E/B B/B 53/66 39/57 4--- (CHC OF RWS OR TSTMS THIS EVE EARLY) IAH T/E B/B 59/70 40/58 61-- (TSTMS ENDING THIS EVE) GLS T/B E/B 60/68 44/56 61-- (TSTMS ENDING THIS EVE)
In the hours before
Special weather statement, Feb 20, 2:58 PM CST, 3 hours 37 minutes before
TXZ176>179-195>200-210>214-226-227-235>238-511-513-163-164-210300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 258 PM CST THU FEB 20 1997 THE NATIONAL WEATHER SERVICE HAS ISSUED ANOTHER TORNADO WATCH FOR SOUTHEAST TEXAS NOW IN EFFECT UNTIL 9 PM. THIS WATCH REPLACES THE PREVIOUS TWO WATCHES PREVIOUSLY IN EFFECT UNTIL 5 PM. COUNTIES INCLUDED IN THE WATCH AREA INCLUDE: AUSTIN...BRAZORIA...BRAZOS...BURLESON...CHAMBERS...COLORADO...FORT BEND...GALVESTON...GRIMES...HARRIS...HOUSTON...JACKSON...LIBERTY... MADISON...MATAGORDA...MONTGOMERY...POLK...SAN JACINTO...TRINITY... WALKER...WALLER...WASHINGTON...AND WHARTON COUNTIES INCLUDING THE ADJACENT COASTAL WATERS. THE WATCH ALSO INCLUDES LEON AND ROBERTSON COUNTIES IN CENTRAL TEXAS. REMEMBER A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE WEATHER AND TORNADOES TO FORM IN AND NEAR THE WATCH AREA. PEOPLE IN THE WATCH AREA ARE URGED TO MONITOR THE LATEST WEATHER CONDITIONS AND BE PREPARED TO SEEK SHELTER SHOULD SEVERE WEATHER THREATEN THE AREA. A FLASH FLOOD WATCH ALSO REMAINS IN EFFECT FOR ALL OF SOUTHEAST TEXAS. STAY TUNED TO NOAA WEATHER RADIO...RADIO OR TELEVISION FOR THE LATEST UPDATES CONCERNING THIS DEVELOPING WEATHER SITUATION.
Nearby
Flash Flood Warnings in Texas, 1997Every flash flood warning in 1997
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.